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Volume 29 , Issue 4
July/August 2016

Pages 357–359

Preliminary In Vitro Study on O-Ring Wear in Mini-Implant–Retained Overdentures

Carolina de Andrade Lima Chaves, DDS, MSc, PhD/Raphael Freitas de Souza, DDS, MSc, PhD/Tatiana Ramirez Cunha, DDS, MSc/Maria Paula Della Vecchia, DDS, MSc/Adriana Barbosa Ribeiro, DDS, MSc/João Felipe Bruniera, DDs, MSc/Yara Teresinha Silva-Sousa, DDS, MSc, PhD

PMID: 27479341
DOI: 10.11607/ijp.4677

This preliminary in vitro study evaluated the simulated retention force of O-rings used for mini-implant overdenture treatment and the effect of mechanical fatigue corresponding to 6 months of wear. A mandibular overdenture analog device was attached to two mini-implants and underwent a tensile strength test before and after the application of insertion-removal and simulated masticatory cycles. Insertion-removal cycles led to a retention loss of 24%, whereas masticatory cycles did not influence retention. Micro-CT scans showed minor deformation following mechanical cycling, but the changes were milder than those observed in similar clinical specimens. Both experimental loading methods led to physical changes in the O-rings, which explains in part the similar clinically observed wear.

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